Vietnam spans several climatic zones, resulting in substantial weather condition variations between the north and the south. Average temperatures year round range from 20 to 35 degrees Celsius so there is no particularly good or bad time to visit Vietnam.

In southern Vietnam: there are two seasons

+ The Wet season : from May to November

Average temperatures : 25 to 35 degrees Celsius

Humidity ranges between 75% and 85%

Rain : Downpour 4 to 10 times / a week

Sun : Scorching sun everyday

+ The Dry season : from December to April

Average temperatures : 20 to 26 degrees Celsius

Humidity ranges between 65% and 75%

Rain : Drizzle down 10 to 20 times / a week

Sun : Light Sun everyday

In north Vietnam : there are four seasons

+ Spring : Febraury, March, April

Average temperatures : 18 to 24 degrees Celsius

Humidity ranges between 40% and 55%

Rain : Drizzle down 15 to 25 times / a week

Sun : Light Sun some days

+ Summer : May, June, July

Average temperatures : 28 to 36 degrees Celsius

Humidity ranges between 75% and 85%

Rain : Downpour 4 to 6 times / a week

Sun : Scorching Sun almost everyday

+ Autumn : August, September, October

Average temperatures : 20 to 28 degrees Celsius

Humidity ranges between 45% and 55%

Rain : autumn rain 2 to 4 times / a week

Sun : autumn Sun, almost everyday

+ Winter : November, December ,January

Average temperatures : 10 to 25 degrees Celsius

Humidity ranges between 35% and 40%

Rain : Drizzle down 4 to 6 times / a week

Sun : Light Sun some days

High tourist seasons : in Vietnam runs from November to March

Lower tourist seasons : in Vietnam runs from April to September

You should monitor local and international weather updates from the World Meteorological Organisation (WMO). You can also access http://www.nhc.noaa.gov for updates